The US Envornmental Protection Agency is proposing pollution controls at six facilities in Arizona to improve visibility at national parks and wilderness areas.
The EPA is proposing a plan to limit emissions such as nitrogen oxides and sulfur dioxide at facilities including Freeport McMoRan’s Miami smelter and ASARCO’s Hayden smelter.
The EPA estimates this would reduce sulfur dioxide by almost 30,000 tons a year and nitrogen oxides by 3,100 tons a year.
The EPA will hold public hearings on February 25 in Phoenix and on February 26 in Tucson. The agency will accept comments for 45 days after publication in the Federal Register.